The name could imply three things; that the handle is a good grip, the tip is a good grip or both. From what I can see right off, both are true to an extent. The handle is made of a dual compound, the different colors are different materials. The darker material is softer than the lighter gray, which is good because it lets the meat of your hand stick while giving a hardness where your thumb (especially) will naturally press into the handle for leverage. Since the gray material is harder it does not lend well to service when sweating a lot, but the ridges formed from the two materials meeting does as well as the concave they added to the harder surface making up for it quite well. Basically, my thumb slips inside the concave a bit, but is kept there via the concave and ridges. I have owned a lot of different screwdrivers in my life and these are definitely top shelf.
Solid in your hand, holds onto screws very well, no stripping or spinning out.
I bought these to finish my set I had bought the 6pcs set and liked them so much I decided to add on the long and stubby 10pcs set the handles feel great in the hand and the diamond covered tips really help bite in to the screw head I'd recommend these to anyone.